Boiler-flue baffle



B. MUSGRAVE. BOILER FLUE BAFF LE. APPLICATION FILED MAR. 20. I922.

Patented Nov. 211, 1922.

3 SHEETS-SHEET I.

B. MUSGRAVE. BOILER FLUE RAFFLE. APPLICATION FILED MAR. 20, x922.

1,436,] 99,, Patented Nov. 21, 1922.,

3 SHEETS-SHEET Z.

B. MUSGRAVE. BOILER'FLUE BAFFLE. APPLICATION FILED MAR. 20, I922.

Patented Nov. 21, 1922.

3 SHEETS-SHEET 3.

Patented Nov. Zl, 1922.

BERNARD MUSGRAVE, OF AMERSHAIVE COMMON, ENGLAN D.

BGILER-ILUE BAFFLE.

Application filed March 20, 1922. Serial No. 545,251.

To all 10 7mm it may concern:

Be it known that I, BERNARD Mnsenavn, a subject of the King of Great Britain and Ireland, residing at Amersham Common in the county of Bucks, England, have invented Improvements in Boiler-Flue Battles, oi which the following is a specification.

This invention has reference to internally fired steam boilers and more especially those of the Lancashire Cornish and Yorkshire types provided with battles in the fiue tubes for ensuring more complete combustion of the gases or greater transmission of heat to the water.

In the specification of my British Letters Patent No. 8429 dated 4 April 1911 I have described a boiler flue battle built up of a number of strips of fireclay or like material angularly displaced-in relation to each other so that the overlapping strips approximately form a helix, the strips preferably being formed with recesses and projections at the centre of their length so as to engage and ensure proper relative positions when threaded on a central rod or bolt.

Now the object of the present invention is to facilitate erection of battles of this kind in the boiler flues, to permit of them being readily adjusted to suit the requirements of various boilers and to reduce the liability of the bafiie breaking down when in use.

For these purposes the battle is built up of discs or the like, which, when threaded on a central bar or bolt. constitute the boss of the battle and blades or strips which are fitted into diametrically opposite recesses or gaps in the peripheral portions of the discs; the discs are set on the central bar or bolt so that their recesses or gaps form two helical grooves and the blades or strips can be easily fitted into their recesses or gaps by inserting them one after the other'edgewise into the helical groove and turning them into the recesses or gaps in the disc next the one last fitted with blades or strips so that their wide faces are transverse to the axis of the flue.

The discs may be adjusted relatively about the axis of the bafile so as to vary the pitch of the helical battle formed by the blades or strips.

The blades or strips may be cemented together where they overlap so as to lend support one to the other.

In some cases the discs may be formed with central circular projections and recesses which engage onein the other so that when cemented together the discs will not require a central bolt or bar but may be supported at intervals on suitable bearers.

Referring to the accompanying drawings Fig. 1 and 1 illustrate in plan baiiles built up according to the invention in the two lines (shown in. section) of a boiler; the two balfies respectively i'orm right and left hand helices and differ slightly as hereinafter mentioned. 1

Figs. 2 and 3 illustrate in end and edge view respectively one of the discs constituting the boss of the battle; Figs. 4: and 5 are similar views to Figs. 2 and 3 of amodified form of disc in which a number of recesses or gaps for blades or strips are formed.

Fig. 6 is a diagrammatic view illustrating a suitable form of bearer for supporting the battle centrally in dues of difi erent diameters. Figs. 7 and 8 are detail views of a modification showing recesses at the upper part only of the disc; and Fig. 9 represents another modification showing recesses of dove-tail form. 4

Referring to the battle shown in the left hand fine Fig. 1, the boss 1 is constituted of a series of discs 2, such as shown in Figs. 2 and 3 or in Figs. 4 and 5. which are formed with central circular projections 2 and recesses 2 that are engaged one in the other as the baffie is built up. The discs shown in 2 and 3 have diametrirally opposed recesses or gaps 2 and each disc is displaced angularly in relation to :uljacent discs so that the recesses or gaps form two helical grooves into which the blades or strips 3 are fitted as already mentioned; the discs shown in Figs. and 5 are built up in the same way but as each disc is formed with tour recesses or gaps 2 each disc is displaced angularly to a correspondingly greater extent. As each disc is put in position it is cemented to the previous one and the blades or strips fitted in place, the central bolt or bar on which the battle is built up being withdrawn when the cement has set. A length of the boss at each end has no blades or strips in its lower recesses or gaps, and may be constituted by a number of the discs shown in Figs. 2 and 3 set with their gaps in line or by a disc 03? the required thickness having recesses or gaps at the upper part only as shown in Figs. '7 and 8; these end lengths fitted with blades or strips at the upper.

part only similarly to the lengths of boss at the ends.

The bearer shown in Fig. 6 is composed of two parts 5 and 6, the former having curved parts 5 which conform to the interior of a small diameter flue whilst the latter rests on the former and is formed with a curved recess to receive the boss 1; if the bearer is to be erected in a larger flue, grouting is inserted between the fine and those portions of the curved parts 5 which do not touch it and fiat plates are inserted between the parts 5 and 6 so as to bring the latter up to the position required to support the battle centrally in the flue.

Those blades 3 which project from the lower half of the boss may be loosely fitted into the recesses or gaps as their free ends will be supported by the boiler flue, and this arrangement permits movement in the recesses or gaps when the flue contracts. But the recesses or gaps may be dovetailed or wider at the base than at the mouth as shown in Fig. 9 and the blades or strips be correspondingly formed so that the lower ones will be supported clear of the flue wall by the boss.

What I claim is l. Bafl les of the kind referred to built up of discs which constitute the boss of the battle and are formed with diametrically opposite recesses or gaps in their peripheral portions and blades or strips which are fitted into said recesses or gaps, said discs being threaded or set on a. central bar or bolt so that the recesses or gaps therein form helical grooves ,.in which said blades are fitted, substantially as described.

2. Bailles of the kind referred to built up of discs which constitute the boss of the bailie and are formed with diametrically opposite recesses or gaps in their peripheral portions and blades or strips which are fitted into said recesses or gaps, the discs being displaced angularly, their recesses or gaps then forming helical grooves in the boss constituted by them, substantially as described.

3. Battles of the kind referred to built up of discs which constitute the boss of the bafile and are formed with diametrically opposite recesses or gaps in their peripheral portions and blades or strips which are fitted into said recesses or gaps, the several discs being formed with central circular projections and recesses which engage one in the other, substantially as described.

4i. The combination with a boiler fine tube of a bafl'le built up of discs which constitute the boss of the balile and are formed with diametrically opposite recesses or gaps in their peripheral portions and blades or strips which are fitted into said recesses or gaps and spaced bearers on which the discit'ormed boss rests, substantially as described.

5. The combination with a boiler flue tube of a baii'le built up of discs which constitute the boss of the battle and are formed with diametrically opposite recesses or gaps in K.

their peripheral portions and blades or strips which are fitted into said recesses or gaps and spaced bearers on which the disc-- formed boss rests, the said discs being formed with central circular projections and recesses which engage one in the other and are cemented together, substantially as described.

6. A baiile of the character described, comprising a series of discs formed with peripheral recesses or gaps, and blades or strips having their ends inserted in said recesses or gaps; said discs being set on a central bar or bolt so that the recesses or gaps therein form a helical groove in which said blades are fitted.

Si ned at London, ltngland this sixth day of March 1922.

BERNARD MUSGRAVE, L'r. Con. 

